# How does resistance affect the brightness of a light bulb?

Contents

## How does resistance affect brightness in series?

The higher the resistance to current in the wiring, circuitry, and bulb, the lower will be the current, lower the power, and lower the brightness. Conversely, lower resistance means more brightness.

## Why is a higher resistance bulb brighter?

High resistance bulbs are brighter in series circuits

Brightness depends on both current and voltage. … So in series high resistance bulbs are brighter because they have a bigger p.d. across them. In parallel circuits low resistance bulbs are brighter because they have a bigger current through them for the same p.d.

## What happens to a bulb with higher resistance?

If the bulb has a resistance less than that, then it will get brighter if you increase its resistance. If the bulb has higher resistance than optimum, then you get more power by reducing the resistance.

## Does brightness depend on resistance?

The brightness of a lightbulb is given by its power. P = I2R, and so brightness depends on current and resistance. If the bulbs are identical, they have the same resistance. … Therefore, when you are asked to rank the brightness of identical bulbs, you are really being asked to rank the amount of current through each.

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## Does more light bulbs mean more resistance?

For less current, the resistance needs to be high and for more current, the resistance low. … In a series circuit, as more bulbs are added, the total resistance becomes higher and so the battery puts out less current. This current goes through each of the bulbs which are therefore dimmer.

## What happens to the resistance of the bulb as the brightness and temperature increases?

The current through a filament lamp is not directly proportional to the potential difference. This is because the filament gets hot, which causes the resistance to increase. At high temperatures, the atoms in the filament vibrate more. … As the potential difference increases, the current no longer increases as much.

## What does brightness of light depend on?

Brightness depends on light wave amplitude, the height of light waves. Brightness is also somewhat influenced by wavelength.

## Do light bulbs have high or low resistance?

Incandescent light bulbs have a small filament which when heated begins to glow and emit light. The reason the filament heats up is because it has a high resistance, which means that as electrons move through the filament, they lose a lot of energy.